Mine

<VirtualHost *>
        ServerName traffic.marucom.es
        DocumentRoot /var/www/mrtg
        <Directory /var/www/mrtg>
                Options +Indexes FollowSymLinks MultiViews
                AllowOverride None
                Order allow,deny
                allow from all
                # Uncomment this directive is you want to see apache2's
                # default start page (in /apache2-default) when you go to /
                #RedirectMatch ^/$ /apache2-default/
        </Directory>

        ErrorLog /var/log/apache2/traffic.log

        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog /var/log/apache2/traffic.log combined
        ServerSignature On

</VirtualHost>